Thats crazy that you now need to prove you have a business to get that service? Don't worry, it cost way more anyway and offers very little extra to be worth it at least in the US. I used to use duckdns years ago, and now I just said screw it and purchased a domain name from namecheap for a few bucks for the year and a few more bucks for the ssl cert then use the ddns service through them and link it to a pc on my network using the small app they provide to keep the IP updated. I use the name for all my services. Sometimes the name will cost way more when renewing in which case ill just pick another one because screw them. Ive used a .co and now using a .space.